Question

A box with a mass of 2.00 kg is initially at rest on a horizontal
frictionless surface. You then pull on a string attached to the
box, exerting a constant force F at an angle of 45° above the
horizontal. This pull causes the box to travel 3.50 m horizontally
in 2.00 s. Use g = 9.80 m/s2.
(a) First, find the box?s acceleration by treating this as a
one-dimensional constant-acceleration problem.